增粘树脂红外光谱的快速鉴别研究

增粘树脂红外光谱的快速鉴别研究

王宇,何琴玲,林中祥(南京林业大学化学工程学院,南京210037)

摘要:增粘树脂因结构差异种类居多,在胶粘剂、涂料和油墨等产品中应用广泛,通过红外分析进行有效快速鉴别对于科研及生产单位是非常必要的。本研究选用不同增粘树脂作为研究对象,分类别比较其FT-I R谱图。研究表明:松香树脂含有酯基(C

C=O

)特征吸收峰,季戊四醇酯的烃链骨架振动为双峰(1058c m-1,1036c m-1),甘油酯为单

峰;萜烯树脂只出现较强的烷烃基团吸收,(D=C H)吸收很弱;C

5

石油树脂在970c m-1有D=C H反式振动吸收,双环戊

二烯树脂同时在970c m-1(反式)与702c m-1(顺式)振动吸收,且有环(C

C-H

)单峰(3040c m-1)出现,氢化后,D=CH

吸收峰减弱或消失;C

9

石油树脂等芳香族树脂有明显的芳环吸收,骨架振动吸收峰随颜色加深有所偏移,D=CH吸收强度增强。

关键词:增粘树脂;红外光谱;特征吸收峰;骨架振动;指纹区

中图分类号:O65713文献标识码:A文章编号:0253-4312(2010)04-0073-05

Study on Fast Identification of Tackifier Resi ns by FT-I R

W ang Yu,H e Q i n li n,Lin Zhongx i a ng

(Schoo l of Che m ical E ngineer i ng,N anj i ng Forestry Universit y,N anjing210037,Chi na) Abstract:There are m any tack ifi e r resi n s w ith different str uctures and are w i d ely used i n adhesives, coatings,i n ks and o t h ers products,and it is very m eaning f u l to conduct a study on t h e fast i d entificati o n through FT-I R for research institutes and production units.D ifferent tack ifier resinsw ere selected for FT-I R analysis.The results sho w ed that rosin resi n has a characteristic absor pti o n peak o f ester group,a shou-l der peak(1058c m-1,1036c m-1)o f hydr ocar bon chai n ske leton v i b ration appeared i n rosi n pentaerythrito l ester and only a si n g le peak appeared i n rosi n g l y cer o l ester;on l y a strong abso r pti o n peak of alky l group w ere appeared in terpene resi n and unsaturated(D=CH)group absorption w as very w eak so m eti m es;C5pe-troleum resins w as ver y si m ilar to ter pene resi n s in FT-I R,butC5petroleum resins had a c lear D=CH trans -v i b rati o n absorption at970c m-1;dicyc l o pentad i e ne resi n s had D=C H trans-v i b ration absorpti o n at970 c m-1and cis-vibration absorption at702c m-1,D=CH absorpti o n peak decreased or disappeared w hen t w o types o f petr o leum resi n s w ere hydr ogenated.W ith deepen i n g of co l o r o f C9petroleum resins,the skeleton vibration absorpti o n peak o f aro m atic ring w as m oved and the absorption intensity o f D=C H absorption peak streng thened.

K ey W ords:tack ifi e r resins;FT-I R;characteristic absorption peaks;skeleton v i b ration; fi n gerpri n t reg i o n

0引言

市场上的增粘树脂主要分为松香树脂、萜烯树脂、石油树脂和芳香族树脂等四大类。增粘树脂在胶粘剂、涂料与油墨等精细化学品行业中有着广泛的用途。增粘树脂的质量稳定性与一致性关系到下游产品的质量性能好坏,部分企业为了降低生产成本,以次充好,严重影响增粘树脂的生产质量。研究发现[1],不同类型、不同生产厂家、不同生产批次的增粘树脂在应用中存在极大的差异性,应用厂家经常会因为使用外观及软化点相近的增粘树脂导致产品不合格,造成一定的经济损失。多数厂家和科研单位已经总结出一些方法来鉴别增粘树脂,如光谱分析、流变学分析、热力学分析、相对分子质量测定等。红外分析是光谱分析中最为广泛的结构分析方法,分析时间短、分析成本低、直观明了、能适用于不同层次的分析人员,因此对各类别增粘树脂进行系统的红外鉴别分析十分必要。在增粘树脂结构研究和定性分析方面,零散报道了A -蒎烯/B-蒎烯共聚物[2]、C

5

石油树脂[3]、C

9

石油树脂[4]、石炭酸松香树脂和马来酸松香树脂[5]、芳香族树脂[6]的红外光谱图及简单的分析,在文献方面无系统的论述。

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第40卷第4期涂料工业V o.l40N o.4 2010年4月PA I NT&COAT I NG S I N DU STRY A pr.2010